Siemens SINAMICS G120 CU240B-2 Operating Instructions Manual page 45

Connecting the motor: Star connection and delta connection
With SIEMENS motors, you will see a
diagram of both connection methods
on the inside of the cover of the
terminal box:
 Star connection (Y)
 Delta connection (Δ)
The motor rating plate provides
information about the correct
connection data.
Examples for operating the inverter and motor on a 400 V line supply
Assumption: The motor rating plate states 230/400 V Δ/Y.
Example 1: A motor is normally operated between standstill and its rated speed (i.e. a speed
corresponding to the line frequency). In this case, you need to connect the motor in Y.
Operating the motor above its rated speed is only possible in field weakening, i.e. the motor
torque available is reduced above the rated speed.
Example 2: If you want to operate the motor with the "87 Hz characteristic", you need to
connect the motor in Δ.
With the 87 Hz characteristic, the motor's power output increases. The 87 Hz characteristic
is mainly used with geared motors.
Connecting the inverter
Motor connection
● If available, open the terminal covers of the inverter.
● Connect the motor to terminals U2, V2 and W2.
● Connect the protective conductor of the motor to the terminal
Inverter with CU240B-2 and CU240E-2 Control Units
Operating Instructions, 07/2010, FW 4.3.2, A5E02299792B AA
Carefully observe the regulations for EMC-compliant wiring:
EMC-compliant connection (Page 46)
The following cable lengths are permissible:
– Unshielded 100 m
– Shielded:
50 m for inverters without filter
25 m for inverters with filter
You will wind additional information in Catalog D11.1 for longer cable lengths
Connecting
3.3 Installing the Power Module
of the inverter.
45